insurance company vs underwriter

insurance company and underwriter both are nouns.

Word	Noun	Adjective	Verb	Adverb
insurance company	Yes	No	No	No
underwriter	Yes	No	No	No

As nouns, insurance company and underwriter are synonyms defined as:

insurance company and underwriter: a financial institution that sells insurance

Other synonyms of insurance company include insurance firm, insurance underwriter, insurer.

insurance company (noun)	underwriter (noun)
a financial institution that sells insurance	a financial institution that sells insurance
	a banker who deals chiefly in underwriting new securities
	an agent who sells insurance